Continue with the beautiful quilt you are making! Don't even THINK about starting over! You could be sewing a half inch seam and it wouldn't matter, as long as you are consistent. Scant quarter inch is ideal because it reduces bulk in seams but it wasn't handed down from the heavens! Consistency is what matters.
You are creating an absolutely beautiful quilt. Keep on as you've been doing and finish this gorgeous thing! You can use your recently acquired quarter inch knowledge on the next one.